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Barium fluoride (BaF2):

Barium fluoride, BaF2, crystal has good transmittance over a wide spectrum range, from 150 nm to 12.5 um. It has been widely used as windows, lenses, and prisms, particularly for ultaviolet transmittance.


BaF2-Transmittance-Curve.jpg


Description
Diameter

Monocrystalline<150m

mPolycrystalline<350mm

Orientation111, 110, 100 direction
Density,g/cm34.83
Lattice constant(nm)0.17536
ColorColorless
Melting point, ℃

1368

Transmission range, um0.2-11
Solubility in water@20℃,g/100 cm3
0.17
Solubility in acidssoluble
Solubility in organic solvents: acetone, spirits, etherinsoluble
Thermal Conductivity@319K, W/(mxK)11.72
Specific Heat Capacity, J/(kgxK)
410
Thermal Expansion@300K, 10-6/C18.1
Young’s Modulus, GPa53.07
Shear Modulus(G), GPa 25.4
Knoop Hardness, kg/mm282
Bulk Modulus(K), GPa56.4
Poisson’s Ratio0.343
Mohs Hardness3.0


Refractive Index as a function of wavelength
Wavelength(um)Refractive IndexWavelength(um)Refractive Index
0141.8155.141.45
0.151.6786.501.44
0.201.5578.001.43
0.261.518.601.42
0.31.509.201.41
0.361.499.801.40
0.481.4810.601.39
1.85
1.47
3.241.46